Preferred Label : alert levels;
Detailed label : alert levels in atmospheric chemistry;
IUPAC definition : Designated concentrations of certain key pollutants at which some degree of danger
to public health is expected. In many areas in which a relatively high level of pollution
is often encountered, several levels of alert are often established. For example,
a first alert may signify a potential problem exists; a second alert becomes a signal
for the curtailment of certain significant emission sources; the third alert signifies
the need for some specified emergency action which must be taken to ensure the public
safety.;
Origin ID : A00215;
See also
Designated concentrations of certain key pollutants at which some degree of danger
to public health is expected. In many areas in which a relatively high level of pollution
is often encountered, several levels of alert are often established. For example,
a first alert may signify a potential problem exists; a second alert becomes a signal
for the curtailment of certain significant emission sources; the third alert signifies
the need for some specified emergency action which must be taken to ensure the public
safety.
